Ohhh the undeleting time frame was changed for everyone in the forum (I don't know exactly why but I'm guessing for if someone has a reason to delete a post, it should be removed immediately – that's just one example though...) and I think it can't be separated for trust levels.
So at the moment, users can't undelete posts. And I have used the Discourse app before too
Anyway whoops sorry I realised I was getting off topic... (@JonnyGamer feel free to talk about it elsewhere!) Actually, I think it might even be worth a new topic... I could move these to a new topic.
I think the ideas you shared with the categories are great! Also I'd thought about this as well and forgotten — reflecting on categories that maybe aren't used as much too. The only thing with voting is that also THT has ideas for categories as providing a direction for discussions, so we may not be able to act on all of them